Especially the $10/month gyms. People feel like they're being proactive by simply having a gym membership, and canceling it would be admitting failure. So they keep the membership and never get around to going. The gyms basically rake in millions of free dollars from people who don't even use their services.

Edit: ok maybe not most, just the ones in urban areas who disobey the laws and blow past me when I'm waiting at a red light. They're the reason why cars stop in the middle of an intersection because they don't know if I'm going to stop or blow through it.